Importance

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Abstract

A system for maintaining the integrity of two substantially identical databases across a computer network consisting of two central processing units interconnected by a communications network includes means within a lock manager for maintaining a lock database on one of the central processing units, means within an application program for initiating a request for a lock to be placed on an identified entity in both of the databases to enable a data update transaction to be performed on the identified entity in both of the databases, and means within the lock manager for locking the identified entity in both of the databases by establishing an entry for the identified entity in the lock database. Such a system for maintaining database integrity also includes means within the application program for entering the data update transaction in a transaction processor queue, means within a network processor for transmitting the data update transaction to a network processor on the other central processing unit, means within a transaction processor for performing the data update transaction on the identified entity and for initiating an unlock request on the identified entity after the data update transaction has been performed, and means within the lock manager for unlocking the identified entity by modifying the entry for the identified entity in the lock database.

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First Claim